Power system of electric vehicle, electric vehicle comprising the same and method for heating battery group of electric vehicle

Abstract

A power system of an electric vehicle, an electric vehicle including the power system and a method for heating a battery group of the electric vehicle are provided. The power system of the electric vehicle includes: a battery group; a battery heater connected with the battery group; a battery management device connected with the battery group and the battery heater respectively, and configured to control the battery heater (102) to heat the battery group intermittently when a temperature of the battery group is lower than a first temperature threshold and a residual electric quantity of the battery group is larger than an electric quantity threshold; an electric distribution box; a motor; a motor controller connected with the motor and the electric distribution box respectively; and an isolation inductor.

Description

CROSS-REFERENCES TO RELATED APPLICATIONS[0001]This application claims priority to, and benefits of Chinese Patent Application Serial No. 201210160396.7, filed with the State Intellectual Property Office of P. R. C., on May 22, 2012, the entire contents of which are incorporated herein by reference.FIELD OF THE INVENTION[0002]Exemplary embodiments of the present disclosure relate generally to a power system and, more particularly, to a power system of an electric vehicle, an electric vehicle comprising the power system and a method for heating a battery group of the electric vehicle.BACKGROUND[0003]With the development of the science and technology, new energy vehicles, especially electric vehicles, gradually enter into ordinary families as a means of transportation. The performance requirement, especially the comfort requirement of a user for the vehicle, is higher and higher, which requires that the vehicle must adapt to different operating requirements. But currently most electric...

AI Technical Summary

Benefits of technology

The power system of this patent allows for heating the battery in an electric vehicle without needing an external power source. This heating can be done intermittently to reduce the strain on the battery and improve its life. The method also allows for the battery to cool down naturally between heating sessions, further improving its performance and ensuring safety. This power system can overcome restrictions on using electric vehicles in cold regions and make them run safely and smoothly. Overall, the invention optimizes the performance of the battery and ensures the safety of the electric vehicle.

Problems solved by technology

But currently most electric vehicles cannot satisfy such requirements.

Especially in winter, the temperature is low so that the capability of a battery, no matter the discharge capability or the battery capacity, may be decreased or the battery cannot even be used.

Under a low temperature condition, the battery in the electric vehicle may have the following problems.

(1) The lithium ions may be deposited easily at the negative electrode and lose the electrical activity at the low temperature, and therefore, if the battery in the electric vehicle is frequently used at the low temperature, the life of the battery may be shortened and a safety problem may be caused accordingly.

Moreover, the deposited ions grow larger and larger during the continuous use, thus leading to a potential danger such as an internal short circuit.

(3) The discharge capability of the battery is limited at the low temperature.

All of the problems listed above may be not favorable for the electric vehicle which uses green and environment friendly new energy.

Many new technologies are applied in the battery heating, but because of the self-capability defects, these technologies are not widely applied in the vehicle field.

These methods are only suitable for the fixed battery.

Furthermore, using the external power to heat the battery is not suitable for the vehicle which is not fixed in position.

Therefore, the above methods have not been widely applied in the electric vehicle field.

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